(1. 重慶大學(xué) 國(guó)家鎂合金材料工程技術(shù)研究中心，重慶 400044；
2. 重慶大學(xué) 材料科學(xué)與工程學(xué)院，重慶 400044；
3. 重慶大學(xué) 機(jī)械傳動(dòng)國(guó)家重點(diǎn)實(shí)驗(yàn)室，重慶 400044)
摘 要: 研究“軋制+固溶+軋制”工藝和“固溶+軋制”工藝對(duì)Mg-Gd-Y-Zn-Mn合金中LPSO相及其組織性能的影響。結(jié)果表明：經(jīng)“軋制+固溶+軋制”工藝處理后，合金中塊狀LPSO相較小，且分布彌散，合金的組織由細(xì)小的再結(jié)晶晶粒組成，最終合金獲得較好的綜合力學(xué)性能，抗拉強(qiáng)度(UTS)達(dá)到347 MPa，伸長(zhǎng)率(EL)為11.6%；經(jīng)“固溶+軋制”工藝處理后，合金中塊狀LPSO相較粗大，分布不均勻，由于固溶退火后析出的層狀LPSO相阻礙合金的再結(jié)晶，軋制后合金中仍存在變形組織，最終合金具有相對(duì)較高的抗拉強(qiáng)度(UTS為358 MPa)，但是伸長(zhǎng)率較低(EL為6.6%); 對(duì)比而言，“軋制+固溶+軋制”工藝易進(jìn)行更大壓下量軋制，進(jìn)而獲得更高綜合力學(xué)性能。
關(guān)鍵字: Mg-Gd-Y-Zn-Mn合金；軋制工藝；LPSO相；顯微組織；力學(xué)性能
（1. National Engineering Research Center for Magnesium Alloys, Chongqing University, Chongqing 400044, China？
2. College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China？
3. The State Key Laboratory of Mechanical Transmission, Chongqing University, Chongqing 400044, China）
Abstract:The influences of “rolling + solution treatment + rolling” process and “solution treatment + rolling” process on LPSO phase, microstructure and property of Mg-Gd-Y-Zn-Mn alloy were investigated in this work. The results show that the block-shaped LPSO phases in the alloy are smaller and dispersive after processing with “rolling + solution treatment + rolling”. And the microstructure of the alloy consists of tiny recrystallization grains. And then the alloy finally obtains a good comprehensive mechanical property, UTS=347 MPa, EL=11.6%. On the other hand, the block-shaped LPSO phases in the alloy are coarser, and its distribution is heterogeneous, after processing with “solution treatment + rolling”. And the deformed structure still exists in the alloy after rolling, since the recrystallization is hindered by the layered LPSO phases which precipitated after solution treatment. Then the alloy finally exhibits a high tensile strength of 358 MPa, but a bad plasticity of 6.6%. The increase of the rolling reduction is beneficial to improve the mechanical property of the alloy. By contrast, the rolling with greater reduction can be processed easily with “rolling + solution treatment + rolling” and then the higher mechanical property can be achieved.
Key words: Mg-Gd-Y-Zn-Mn alloy; rolling process; LPSO phase; microstructure; mechanical property
